I’ve posted on Richard Wiseman’s Blog before – he has some WONDERFUL brainteasers every friday. He also searches out optical illusions – some better than others. The one he had today however, was probably the most persistant illusion I have ever seen! I mean normally, I can see past what seems to be happening to the underlying reality, but today, no matter which way I looked at it, the lines – which were in reality the same length – appeared to be different sizes!
But don’t take my word for it, see for yourself!